COLL 10 |
| The aqueous complexes of poly(ethyleneimine) (PEI), sodium dodecyl sulfate (SDS) and dodecyl maltosides (C12G2) have been studied using dynamic light scattering, electrophoretic mobility and pH measurements. The charged nature and size of PEI/SDS/C12G2 complexes vary in a similar manner with SDS concentration than for the PEI/SDS system. At large excess of SDS a kinetically stable colloid dispersion of the compact PEI/SDS/C12G2 particles forms. The charge reversal of the PEI molecules is considerably enhanced in the presence of dodecyl maltoside therefore kinetically stable PEI/SDS/C12G2 nanocomposites can be prepared in a much wider composition range than in the case of PEI/SDS system. The pH of the PEI/SDS/C12G2 mixtures reveals a peculiar dependence on the surfactant concentration. These latter findings are explained by the synergistic binding of the ionic and non-ionic surfactants to both the uncharged and charged amine groups of the PEI. |
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Surfactants from Renewable Resources
9:00 AM-12:20 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 225, Oral
Division of Colloid & Surface Chemistry |